Mandrel



May 2, 1933.

MANDREL Filed Sept. 9, 1930 H. T. BATTIN 2 Sheets-Sheet 1 INVENTOR harold T Edi in %z;fi ATTORNEY May 2, 1933.

H. T. BATTl N MANDREL Filed Sept. 9, 1930 2 Sheets-Sheet 2 INVENTOR Patented May 2, 1933 UNITED/STATES? PATENT. OFFICE HAROLD T. BATTIN, or mnenwoon, mew annsntnssreivon To Mamas & WRIGHT;

or DETROIT, MICHIGAN, A CORPORATION or MICHIGAN MANDREL Application filed September 9, 1930. Serial N0.'480,701.

My present invention relates to mandrels and more particularly to anfimproved sectional mandrel for use in the manufacture/of endless tubes from latex or an I aqueous dispersion of rubber. 7

The most modern way of building tubes such as used in automobile tires isv by the use of the latex deposition process wherein the latex is deposited on the outer surface of an annular mandrel andafter such deposition the mandrel is withdrawn from the interior of the endless tube through a performed opening in which may be afterwards placed the valve by means'of which the inner tube may be inflated. Heretofore such mandrels have been made of. sections which .30 an improved endless mandrel; Y

In the accompanying drawings illustrating the tioni Figure 1 is an elevation; Fig.2 is a section on the line 22 of Fig. 1;

preferred embodiment of my inven- Fig. 3 is a section on the line 3 3 of Fig.

2; and I V Fig. 4 is a vertical section of. the bottom of themandrel illustratedin Fig. 1.

Referring to the drawings 10 and 11 designate arcuate .members substantially circular in cross section and semi-cincular in form. vSuch members 10 and 11 are hollow 5 and throughout their surfaces are provided with passages .12 extending from the interior to the exterior thereof. The outer surface ofbotharcuate members 10 and .11;.

are knurled as indicated at 13 in Fig. 1,

i suchknurling'forming a network of shallow grooves over the entire surface of the arcuate members and this network of grooves communicates with the perforations 12.

In, the upper end of thej'arcuate member,

10,- as viewed in the drawings, is fitted a sleeve 14, this sleeve being held into position relative to the member 10 by a pin 15; Extendingtransversely of and being anchored in the sleeve 14 is a rod or shaft 16 on which is rotatably mounted a sleeve 17 her 18. This member 18 has theouter end thereof threaded as indicated at 19 and -associated withsuch threaded end is a nut 20. Slidably' mounted in the outer end of the sleeve 14 is a plug 21 provided with a groove.

15a which cooperates with the pin 15,. the

outer peripheral edgeof which is rounded as indicated at 22 for a purposeto be hereinafter described. Formed integral with the plug 21 and on the outer end thereof is a cylindrical portion 23. and this cylindrical portion is counterbored to. form a chamber 24. 'Theplug 21 is provided witha longitudinal perforation through which extends the memberlS and the nut 20 screwing on the threads 19'forces the plug 21 into the sleeve 14and brings the rounded peripheral edge 22 .of such plug into intimate engagement with the open end of the sleeve 14 which covers the arcuate member 10. The perforations 12 in the arcuate member 10 in that portion of the member occupied by the sleeve 14 are extended through the sleeve 14 so that the said perforations communicate with the interior of the sleeve 14.

Secured, in the openend of the arcuate member'lOxby pin 25 isa sleeve 26' and extending transversely of the sleeve and hav having formed integrally therewith a memi ing its ends resting therein is a rod or shaft 27 Rotatably mounted on the rod 27 is a sleeve 28 which has formed integral therewith a rodor shaft 29, the outerend of this rod'being threaded as indicated at 30. 'As-- sociated with the threaded end 30 is a nut 31.

Fitting intothe open end of the sleeve 26.

and prevented from rotarymovement with respect thereto by a pin 32 engaging in a slot 33 in the sleeve 26 is a cylindrical memher 34. This cylindrical member is provided with a perforation through which extends the rod or shaft 29 and the nut 31 holds the sleeve 34 in position in the sleeve 26. The outer peripheral edge of the cylinder member 34 is rounded as indicated at 35 to engage the outer edge of the arcuate member 11 for a purpose to be hereinafter described. The sleeve 34 is counterbored as indicated at 36 to fit over the cylindrical member 23 of the plug 21. The perforations 12 in that portion of the arcuate member 11 occupied by the sleeve 26 are continued through such sleeve 26 so that the interior of the sleeve 26 communicates with the outer surface of the arcuate member 11. The plug 21 and cylindrical member 34 are drilled longitudinally at a plurality of points as indicated by the numeral 37 to provide a passage between the arcuate members 10 and 11.

When the cylindrical member 34 is fitted over the cylindrical port-ion 23 of the plug 21,2153 indicated in Fig. 3, the walls of the cylindrical member 34 and member 23 are drilled to receive a taper plug 38, and the wall of the cylindrical member 34 is threaded as indicated at 39 to receive the threaded end 40 of such taper plug 38. The arcuate member 11 surrounding the outer portion of the tapered member 38 is recessed as indicated at 41 to provide a chamber in which fits a hollow ring 42 for a purpose to be hereinafter'decribed. The taper plug 38 is drilled longitudinally, and the outer end thereof is provided with a plurality of grooves 43 which assist in holding a flexible conduit to such taper plug 38 and through which conduit a source ofvacuum orpressure may be attached. Intermediate the groove 43 and the taper portion of the taper plug 38 is provided a member 44, and by means of which the taper plug .38 may be rotated to either lock the arcuate members 10 and 11 together, as indicated at Fig. 3 or allow such members to be separated from each other, or to support said members 10 and 11 without touching the latex deposit on said members. 7

In the lower open end of the arcuate meniber '10 is fitted a sleeve 46, this sleeve being held in position by a pin 47. Extending transversely of the sleeve 46 is a rod or shaft 48 on which is rotatably mounted a sleeve 49. Formed integral with such sleeve 49 is an outwardly extending rod, or shaft 50. The outer end of such shaft is threaded as indicated at 51 to receive a nut 52. That portion of the arcuate member 10 occupied by the sleeve 46 has the perforations12 at such portions extending through the sleeve 46 as above described for the sleeves 14 and 26. Slidably mounted in the open end of the sleeve 46 is a plug 53, this plug being provided with a groove 54 in which fits a pin 55 carried by the sleeve 46 and which allows and 11.

The outer central portion of the plug 53 is counterbored to receive as a sliding fit a portion of a cylindrical collar 58, whlch may, if

desired, be maintained in such counterboredportion and held against rotation or remov a1 by a pin 59. The open end of the arcuate member 11 is fitted with a sleeve and plug corresponding in construction to the sleeve and plug 46 and 53, respectively, and as these constructions are identical the construction for the open end of the arcuate member 11 will not be described in detail. Fitting over each of the arcuate members 10 and 11 is a fabric sleeve and the ends of the sleeve 60 on the arcuate member 10 are brought inwardly and right between the inner outer surface of the sleeve 14 and the rounded portion 22 of the plug 21 and between the inner surface of the sleeve 46 and the outer rounded surface 56 of the plug 53 and such rounded portions 22 and 56 serve to hold the sleeve 60 in position. Similarly the fabric sleeve 60 on the arcuate member 11 has its ends held in position by the rounded end 35 of the cylindrical member and the sleeve and plug located in the lower open end of such arcuate member. The portion of the fabric sleeve 60 surrounding the taper plug 38 is forced into the recess 41 and is held in such recess by the ring 42.

Assuming that the device has been constructed and assembled as above described and that it is desired to form an endless latex tube thereon, and remove the mandrel from the inside of such tube a conduit (not shown) is attached to the groove portion 43 of the taper plug 38 and vacuum applied to the interior of the arcuate members 10 The entire construction is then dipped into a bath of powdered chalk or whiting anda (layer of such chalk or whiting is deposited on the outer surface of the fabric sleeves 60. The structure is then removed from such bath and the coating of whiting or powdered chalk allowed to dry, this coating forming a filter bed for the subsequent operation. After drying and with the vacuum still applied to the tapered plug 38 the entire structure is placed in a latex bath, whereupon such latex is deposited on the fabric sleeve 60. After the deposit has acquired the proper thickness, the entire structure is removed from the bath and allowed to dry with preferably the vacuum I still being applied to the taper plug 38. After drying, the source of vacuum may be removed from the tapered plug 38 and the late'x'endless tube is vulcanized, After vulcanization, the tapered plug 38 is removed, from the position shown in Fig. 3 and the operator will slide the cylindrical portion 23,

from the cylindrical "chamber 36 and the preformed hole inthe endless tube formed of necessity by the presence of the tapered plug 38 is distended and slid over the outer end of the arcuate member 11.. The con struction of the cylindrical sleeve 58 and the counterbored portions in the sleeves 41-6 in the lower ends'of the arcuate members 10 and 11 is such as to permit a separating movement of the arcuate members 10 and 11, with respect to each' other, while still maintaining the same invertical alignment. The mandrel composed of the arcuate members 10 and 11 may now be readily fed through the valve hole in the endless latex tube and to facilitate this operation, it is preferable to insert the end of an air hose between the endless tube and the outer surface of the fabric sleeves 60. The introduction of air through such air hose will in- -flate the endless latex tube and it will be could not move along a line parallel to the surface of collar 58 without bending :the-

tube (because of its circular shape), thereby causing pinching between collar '58'and plug 53 in member 11. p

Having thus described my invention what I claim and desire to protect by Letters 1 Patent is:

V 1. In an, improved mandrel, the combination of a plurality of hollow arcuate members assembled to form a rigid annulus,

shells fitting into the open end of adjacent arcuate members, male and female locking members removably mounted in the shells, and a locking bolt cooperating with the male and female lockingmembers for locking the arcuate members'toadjacent ends of gether.

2. An endless mandrel comprisingaplurality of separable curved sections, shells fitting into the adjacent ends of said sec tions,.pivotally mounted supporting bolts;

3; An endless mandrel comprising a plurality of curved sections, a covering of tubular fabric for said sections,the ends of said fabric extending into a pair of adjacent ends of said sections, and means in said adjacent ends of the sections for fastening said ends of the fabric in place.

4. An endless mandrel comprising a plurality of curved sections, a covering of tubular fabric for said sections, the ends of said fabric extending into a pair of adjacent ends of said sections, and clamping rings for said fabric ends for securing them within the mandrel.

5. An endless mandrel comprising a plurality of curved sections, a covering of tubular fabric for said sections, the ends of said: fabric extending into a pair of adjacent ends of said sections, and clamping rings for said fabric ends for securing them within the mandrel, said rings and adjacent ends of said sections having complementary curved clamping surfaces.

Signed at Passaic, county of Passaic, State of New Jersey, this 4th day of Sept,

1930. HAROLD T. BATTIN.

carried by said shells, telescoping ring members carried by saidsupporting bolts, and

means. forlocking' said sections and mem-: bers together. 

